Travel cot at home for 2 weeks before so it's familiar. Took ours from a sleep disaster to no issue.

Slumberpod - black out tent that goes over travel cot. Genuinely worth £150 if you travel a lot.

Familiar sleep sack and white noise machine - smells and sounds of home.

Don't fight the local time zone. First day rough, by day 3 they're adjusted.

Accept first 2 nights will be rough then move on. Don't pre-stress.